A metal strip can be obtained during A Void Dance by using a Curious tool on a workbench, when you are in the Black Knight Workshop.
Thieving - The RuneScape Wiki
Bloodveld - OSRS Wiki
RS PRO Barrier Strip, 28 Contact, 9.5mm Pitch
Steel mattock - The RuneScape Wiki
Tyr, RuneScape Wiki
Category:Metals, RuneScape Wiki
Material cache (hellfire metal) - The RuneScape Wiki
Man (A Void Dance), RuneScape Wiki
A Void Dance - The RuneScape Wiki